export pdirty, mdirty through remote type

remote sync from setters.

add sync to tests.

tests/helper_test.go

@@ -3,6 +3,7 @@ package voicemeeter_test
 import (
 	"os"
 	"testing"
+	"time"
 
 	"github.com/onyx-and-iris/voicemeeter-api-go/voicemeeter"
 )
@@ -17,3 +18,9 @@ func TestMain(m *testing.M) {
 	vmRem.Logout()
 	os.Exit(code)
 }
+
+func sync() {
+	time.Sleep(30 * time.Millisecond)
+	for vmRem.Pdirty() || vmRem.Mdirty() {
+	}
+}